ACHE and memory impairment: The protective effects of KBD (100 and 250 mg/kg, p.o.)and standard reference compounds, including an antioxidant (vitamin C, 200 mg/kg, p.o.), and acetylcholinesterase inhibitor (donepezil,1 mg/kg, p.o.)on learning and memory impairment in Aβ1–42-induced AD rats were investigated using the MWM test and ORT.